eCFR.io
Daily eCFR

Appendix A to Part 439—Tables

Tables

  1. CFR
  2. ›
  3. Title 40
  4. ›
  5. Chapter I
  6. ›
  7. Part 439
  8. ›
  9. Appendix Appendix A to Part 439
CorpusDaily eCFR
Displayed edition2026-04-27
Last updated2026-04-27

Appendix A to Part 439—Tables

Table 1—Surrogate Parameters for Direct Dischargers

[Utilizing biological treatment technology]

Regulated parametersTreatability class
Amyl alcoholAlcohols.
Ethanol 1
Isopropanol 1
Methanol 1
Phenol
Isobutyraldehyde 1Aldehydes.
n-Heptane 1Alkanes.
n-Hexane 1
Diethylamine 1Amines.
Triethylamine
BenzeneAromatics.
Toluene 1
Xylenes 1
Chlorobenzene
o-Dichlorobenzene
Chloroform 1Chlorinated Alkanes.
Methylene chloride 1
1,2-Dichloroethane 1
Ethyl acetate 1Esters.
Isopropyl acetate
n-Amyl acetate
n-Butyl acetate
Methyl formate
Tetrahydrofuran 1Ethers.
Isopropyl ether
Acetone 1Ketones.
4-Methyl-2-pentanone (MIBK)
Ammonia (aqueous)Miscellaneous. 2
Acetonitrile
Methyl Cellosolve
Dimethyl Sulfoxide
1 These parameters may be used as a surrogate to represent other parameters in the same treatability class.
2 Surrogates have not been identified for the “Miscellaneous” treatability class.

Table 2—Surrogate Parameters for Indirect Dischargers (Utilizing Steam Stripping Treatment Technology)

Regulated parametersTreatability class
Benzene
Toluene 1
Xylenes
n-HeptaneHigh strippability.
Chloroform 1
Methylene chloride 1
Chlorobenzene
Ammonia (aqueous)
Diethyl amine
Triethyl amine
Acetone 1
4-methyl-2-pentanone
n-Amyl acetate
n-Butyl acetate
Ethyl acetateMedium strippability.
Isopropyl acetate
Methyl formate
Isopropyl ether
Tetrahydrofuran 1
1,2-dichloroethane
o-Dichlorobenzene
1 These parameters may be used as a surrogate to represent other parameters in the same treatability class.

[63 FR 50437, Sept. 21, 1998; 64 FR 10393, Mar. 4, 1999, as amended at 68 FR 12275, Mar. 13, 2003]